Pin Control Functions
 
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IO(x) is the simplest way to access the digital pins.  Read IO(x) and the pin becomes or stays an input and the value is returned.  Write to IO(x) and the pin becomes or stays and output and is set low when 0, or high for all other values.

For firmware after 8.11, IO(x) accesses the upper ports (P1 through P4), in groups of 32, IO(32) through IO(63) access P1(0) through P1(31) and so on.

Pin Control Functions 
    AD 
    BYTEBUS -- obsolete 
    DIR 
    HIGH 
    IN 
    INPUT 
    IO 
    LOW 
    OUT  
    OUTPUT 
    Port P0..P4